2. 外语
  3. You______the flowers, for it is going to rain.

You______the flowers, for it is going to rain.

admin2010-05-03  52
问题 You______the flowers, for it is going to rain.
选项 A、watered
B、would have watered
C、needn’t have watered
D、needed to water
答案C
解析 “should/ought to+完成时态”表示过去应该干而没有干的事，“shouldn’t/ought not to+完成时态”表示过去不应该干而干了的事，“needn’t+完成时态”表示没必要干的事却干了，“must+完成时态”表示对过去情况非常肯定的推测。如：You should have given her more help. 你应该多给她帮助。You shouldn’t have tried the experiment on him. 你不应该在他身上做这个实验。We needn’t have told him the news because he knew it already. 我们没必要告诉他这个消息，因为他已经知道了。He must have been lost. 他一定是迷路了。
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